Autoresolve is not working with sieges vs big cities.

epic_159733403258ryelqNz

Something is wrong, I have 2 maxed armies with praetorian guards, fully researched military technologies so they have maximum melee and defense bonus and also both weapons and armor upgraded.
I got double the unit size vs the defender.

Image:

CA_Grimfeld

Might this be related to any mods you are using?

Benjin

EDIT: I noticed you were using my AAA Generals: Rome mod and the rank 10 Roman general (purple cloak) was missing his muscle armour. I've figured out what the issue was, so thanks for posting that image!